Diff: main.cpp

Revision:

0:092b5e724233

Child:

1:4be688be4e0d

diff -r 000000000000 -r 092b5e724233 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 15 17:08:18 2014 +0000
@@ -0,0 +1,110 @@
+// In this example an MQTT client is created.
+// It is publishing parameters measured by a DHT11 sensor
+// UIPEthernet library is used to drive the ENC28J60 board
+#include <mbed.h>
+#include <UIPEthernet.h>
+#include <UIPClient.h>
+#include <MQTTClient.h>
+#include <DHT11.h>
+
+// UIPEthernet is the name of a global instance of UIPEthernetClass.
+// Do not change the name! It is used within the UIPEthernet library.
+// Adapt the SPI pin names to your mbed platform/board if not present yet.
+#if defined(TARGET_LPC1768)
+UIPEthernetClass UIPEthernet(p11, p12, p13, p8);        // mosi, miso, sck, cs
+DHT11   dht11(p6);
+#elif defined (TARGET_NUCLEO_F103RB)
+UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6);   // mosi, miso, sck, cs
+DHT11   dht11(PC_14);
+#endif
+
+// Make sure that the MAC number is unique within the connected network.
+const uint8_t       MY_MAC[6] = {0x00,0x01,0x02,0x03,0x04,0x05};
+// IP address must be unique and compatible with your network too. Change as appropriate.
+const IPAddress     MY_IP(192,168,1,181);
+char                message_buff[100];
+void                onMessage(char* topic, uint8_t* payload, unsigned int length);
+IPAddress           serverIP(192,168,1,30);  // MQTT server (e.g. 'mosquitto' running on a Raspberry Pi or Ubuntu)
+EthernetClient      ethernetClient;
+void                onMqttMessage(char* topic, uint8_t* payload, unsigned int length);
+MQTTClient          mqttClient(serverIP, 1883, onMqttMessage, ethernetClient);
+const int           PERIOD = 10;             // seconds
+
+Serial              pc(USBTX, USBRX);
+
+int main()
+{
+    const int   MAX_COUNT = 5;
+    int         i = 0;
+    bool        connected = false;
+    time_t      t = 0;
+    time_t      lastTime = 0;
+    
+    // initialize the ethernet device
+    Ethernet.begin(MY_MAC, MY_IP);
+    pc.printf("Connecting to MQTT server ..\r\n");
+    do {
+        wait(1.0);
+        connected = mqttClient.connect("myMqttClient");
+    } while(!connected && (i < MAX_COUNT));
+
+    if(connected) {
+        pc.printf("MQTT Server connected.\r\n");
+        mqttClient.subscribe("rt_clock");
+        pc.printf("Subscribed to: ");
+        pc.printf("rt_clock\r\n");
+    } else {
+        pc.printf("Failed to connect to MQTT server.\r\n");
+    }
+
+    while(1) {
+        t = time(NULL);
+        if(t >= (lastTime + PERIOD)) {
+            lastTime = t;
+            if(connected) {
+                sprintf(message_buff, "%ds:\r\n", t);
+                pc.printf("---------------------\r\n");
+                pc.printf(message_buff);
+                int state = dht11.readData();
+                if(state == DHT11::OK) {
+                    float hum = dht11.readHumidity();
+                    sprintf(message_buff, "%4.1f", hum);
+                    pc.printf("  hum = %s%%\r\n", message_buff);
+                    mqttClient.publish("outdoor/humidity", message_buff);
+                    float temp = dht11.readTemperature();
+                    sprintf(message_buff, "%5.1f", temp);
+                    pc.printf("  temp = %s'C\r\n", message_buff);
+                    mqttClient.publish("outdoor/temperature", message_buff);
+                    float dewPoint = temp - (100 - hum)/5.0;
+                    sprintf(message_buff, "%5.1f", dewPoint);
+                    pc.printf("  dew point = %s'C\r\n", message_buff);
+                    mqttClient.publish("outdoor/dewpoint", message_buff);
+                }
+                else
+                    pc.printf("  DHT11 error: %d\r\n", state);
+            }
+        }
+        mqttClient.loop();  // MQTT client loop processing
+    }
+}
+
+void onMqttMessage(char* topic, uint8_t* payload, unsigned int length)
+{
+    int i = 0;
+
+    pc.printf("Message arrived:\r\n");
+    pc.printf("  Topic: %s\r\n", topic);
+    pc.printf("  Length: %d\r\n", length);
+
+    // create character buffer with ending null terminator (string)
+    for(i = 0; i < length; i++) {
+        message_buff[i] = payload[i];
+    }
+
+    message_buff[i] = '\0';
+    pc.printf("  Payload: %s\r\n", message_buff);
+}
+
+
+
+